An international team of scientists has developed a method that helps people better recognize fake news and resist conspiracy theories. The study, published in the Journal of Experimental Social Psychology (JESP), suggests using a short message that stimulates critical and open-minded thinking as a kind of “cognitive vaccine” against disinformation.

How Does the “Vaccine” Work?

The researchers focused on developing so-called actively open-minded thinking — an approach in which a person is willing to reconsider their beliefs, evaluate evidence objectively, and avoid hasty conclusions.

In the experiment, participants were shown a short text explaining common cognitive errors:

  • Overconfidence: the belief that one’s own opinion is always correct.
  • Ignoring alternatives: unwillingness to consider other explanations.
  • Confirmation bias: interpreting all facts as evidence of one’s preexisting beliefs.

The text ended with a simple call: “Don’t believe everything you see.” This message encouraged people to be more attentive to information and to check its reliability.

Results of the Experiment

In two online studies involving nearly a thousand participants, the researchers tested the effectiveness of this approach. The results showed that even a short message significantly increased levels of open-minded thinking. Participants who read the text demonstrated:

  • Better ability to distinguish real news from fake news.
  • Lower tendency to share disinformation online.
  • Reduced belief in conspiracy theories.

“The key is not to tell people what to think, but to teach them how to think. Critical thinking provides broader protection against disinformation than debunking individual fake stories,” said psychologist Micki BiddleStone of the University of Kent, one of the study’s authors.

Why Is This Important?

In an age of information overload, when fake news and conspiracy theories spread at lightning speed, the ability to critically assess information has become an essential skill. A simple message reminding people about cognitive traps can be an effective tool against manipulation. This approach requires no complex instructions or specialized knowledge — only awareness of one’s own biases and a willingness to reconsider them.

In Short…

The study offers a simple and accessible way to fight disinformation — by developing actively open-minded thinking. A short text warning about cognitive errors helps people recognize fake news more effectively, share false information less often, and treat conspiracy theories more skeptically. This “cognitive vaccine” may become an important step toward building a more mindful approach to information on the internet.